Bosch's X-LOCK Cup Brushes feature the X-LOCK mount that offers a change out that's up to five times faster than conventional interfaces. There’s an audible snap when mounting an X-LOCK wheel on an X-LOCK grinder. The wheel mounts properly without the need for a spanner wrench or flange nuts. The wheel is released from the grinder with the pull of a lever. Bosch Cup Brushes are ideal for removing weld scale, burrs, and corrosion. These cable knotted and stringer bead wire cup brushes are made with carbon steel, designed specifically for faster, more aggressive material removal. The precision-balanced cup virtually eliminates vibration and they are made with high-quality materials. X-LOCK Cup Brushes are not backward compatible with standard 7/8 In. mounts.